Not an item description problem, but the description for the Soul Linker skill Estun is incorrect. It reads like it's "Estin" for Medium monsters, but it doesn't have a knockback effect, it has a "sometimes stun" effect, since it is affected by VIT like any other stun effect.
Hero Wrote:Push back a targeted monster 2 cells away. Only Medium sized monsters are damaged by this skill, which takes the elemental property of the Mild Wind skill if it is cast.
At skill level 7, Estun will have a 3 second delay that will allow the casting of the Esma skill.
RMS Wrote:Magical skill that attacks only Medium monsters. The affected monster is stunned for 2 sec. When this is used on Small monsters it won't stun them, but it will do full damage.
When LV 7 version of this skill is used, you can use Esma for next 3 seconds.
"Es" type magic can only be used on monsters. If it is used on a player character, nothing happens and the caster will be stunned for 0.5 sec (not reduced by VIT).